• Johnny Valdez posted an update in the group Group logo of What is it?What is it? 1 year, 5 months ago

    1 year, 5 months ago
    1 year, 5 months ago

    This is my first post asking for help in  identifying a variety of bones I’ve recently found. This was found yesterday on a rock bank on the Colorado River in Southeast Texas in Wharton County.  Thought it was unusual and online searches have left me clueless.  Anyone know what it is? 

    • I can tell you it is not bone. I don’t see any of the normal internal bone structures like osteoclasts or typical bone porosity.

    • Looks like a sedimentary rock that is calcium carbonate based. You can test this with something like vinegar with 5% acid or CLR. If calcium carbonate based it would fizz. The stronger the acid the more fizz. If it were bone it would not fizz unless coated with a calcium carbonate matrix.

    • This is a description of the geology from the area mentioned

    • Oops mentioned

    • “Beaumont Formation


      clay, silt

      On McAllen-Brownsville Sheet (1976) dominantly clay and mud of low permeability. (from Moore and Wermund, 1993a, 1993b): Light- to dark-gray and bluish- to greenish-gray clay and silt, intermixed and interbedded; contains beds and lenses of fine sand, decayed organic matter, and many buried organic-rich, oxidized soil(?) zones that contain calcareous and ferruginous nodules. Very lt. gray to v. lt. yell-gray sediment cemented by calcium carbonate present in varied forms, veins, laminar zones, burrows, root casts, nodules. Locally, small gypsum crystals present. Includes plastic and compressible clay and mud deposited in flood basins, coastal lakes, and former stream channels on a deltaic plain. Disconformably overlies Lissie Fm. Thickness 5-10 m along north edge of outcrop; thickens southward in subsurface to more than 100 m.”

    • Wow…that’s pretty cool. Thanks Kim for that information!